Steam-engine



(o Model.)

J. o. WLsoN.

. STEAM ENGINE. N. 280,703. l Patented July 3, 1883.

fz'gl. 1: 1r

Wvzsses: l Invenor.-

una nphar. wasmngwn. 0,0.

UNITED STATES PATENT OFFICE.

JOHN o. WILSON, OE CAMERON, rrExAs.

STEAM-ENGINE.

' SPECIFICATION forming part of Letters Patent No. 281703, dated July 3, 1883.

Application tiled March 10, 1883.

T 0 all whom, it may concern:

Be it known that I, JOHN C. WILsoN, a citizen of the United States, and a resident of Cameron, in the county of Milam and State of 5 Texas, have invented certain new and useful Improvements in Steam-Engines; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference markedthereon, which form a part of this specification.

Figure 1 of the drawings is a vertical sectional view of my engine. Fig. 2 is a side view of the piston, and Fig.v 3 is an end view of the same. y

' This invention has relation to rotary steamengines, and it consists in the construction and novel arrangement, in connection with a cylinder having bearings for the piston-shaft at each end and steam and exhaust ports at opposite ends, of an axially-elongated piston having opposite spiral threads or ribsl of gradually-decreasing pitch from the end at which the steam enters to the end at which it escapes, all as hereinafter set forth.

In the accompanying drawings, the letter A designates the steam-cylinder, having bearings B at each end for the piston-shaft C, which projects beyond the end of the cylinder to receive a fly-wheel, D, whereof the weight is supported on an additional bearing, as indicated at E.

At one end of the cylinder A is formed the inlet F for the steam, and at the other end of the cylinder, on the underside, the exhaust G. l H represents the piston, which is of elongated cylindrical form and is firmly keyed on 4o the shaft C. l

On the piston H are the Opposite spiral ribs K, which extend from end to end thereof and have a gradually-decreasing pitch from the (No model.)

end at which the' steam enters to that at which it escapes. rIhese spiral ribs are designed to move in. steam-tight contact with the internal cylindrical surface of the steam-cylinder, so that there are formed between the cylinder and the body of the piston two spiral steam chambers or passages, L and L, of graduallydecreasing breadth. 'The steam enters at the larger end of one of these chambers, and, passing forcibly to the smaller endthereof, is discharged, the piston being turned by the impulse of the steam rather than by its expansive t power. The activity of the steam is exerted to pass from the inlet-opening to the exhaust in the shortest possible time, and as it is exerted in spiral passages connected to a freelymoving cylinder, the latter is turned by the direct impulse.

By forming the spirals upon the piston with agradually-decreasing pitch, as described, it will be readily seen that the steam will become more obstructed in its passage through the cylinder, and its body made more dense in the direction of the exhaust-port, thus utilizing its expansive properties.

Having described this invention, what I claim, and desire to secure by Letters Patent, Is

The combination, with a cylinder having bearings for the piston-shaft at each end and steam and exhaust ports at opposite ends, 'of

spiral threads or ribs of gradually-decreasing pitch extending fromk the steam end to the ex'- haust end and moving in steam-,tight contact with the inner wall of the Steam-cylinder, substantially as specified.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN C. VILSON.

an axially-elongated piston having opposite Witnesses: i

T. C. STAFFORD, W. T. HEELEY. 

